USN-3170-1: Linux kernel vulnerabilities

Releases

• Ubuntu 16.10

Packages

• linux - Linux kernel

Details

Dmitry Vyukov discovered that the KVM implementation in the Linux kernel
did not properly initialize the Code Segment (CS) in certain error cases. A
local attacker could use this to expose sensitive information (kernel
memory). (CVE-2016-9756)

Andrey Konovalov discovered that signed integer overflows existed in the
setsockopt() system call when handling the SO_SNDBUFFORCE and
SO_RCVBUFFORCE options. A local attacker with the CAP_NET_ADMIN capability
could use this to cause a denial of service (system crash or memory
corruption). (CVE-2016-9793)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.10

• linux-image-powerpc-smp - 4.8.0.34.43
• linux-image-powerpc-e500mc - 4.8.0.34.43
• linux-image-4.8.0-34-lowlatency - 4.8.0-34.36
• linux-image-generic-lpae - 4.8.0.34.43
• linux-image-4.8.0-34-generic - 4.8.0-34.36
• linux-image-4.8.0-34-generic-lpae - 4.8.0-34.36
• linux-image-4.8.0-34-powerpc64-emb - 4.8.0-34.36
• linux-image-generic - 4.8.0.34.43
• linux-image-4.8.0-34-powerpc-e500mc - 4.8.0-34.36
• linux-image-lowlatency - 4.8.0.34.43
• linux-image-powerpc64-emb - 4.8.0.34.43
• linux-image-4.8.0-34-powerpc-smp - 4.8.0-34.36

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

• CVE-2016-9756
• CVE-2016-9793

Related notices

• USN-3168-2: linux-image-3.13.0-107-generic, linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-107-generic-lpae, linux-image-generic-lts-trusty, linux-lts-trusty
• USN-3168-1: linux-image-3.13.0-107-powerpc-smp, linux-image-3.13.0-107-powerpc-e500mc, linux-image-3.13.0-107-powerpc64-emb, linux-image-3.13.0-107-generic, linux-image-3.13.0-107-generic-lpae, linux, linux-image-3.13.0-107-powerpc64-smp, linux-image-extra-3.13.0-107-generic, linux-image-3.13.0-107-powerpc-e500, linux-image-3.13.0-107-lowlatency
• USN-3169-2: linux-image-4.4.0-59-powerpc64-emb, linux-image-4.4.0-59-powerpc-smp, linux-image-4.4.0-59-lowlatency, linux-image-4.4.0-59-powerpc-e500mc, linux-image-4.4.0-59-generic-lpae, linux-image-4.4.0-59-generic, linux-lts-xenial, linux-image-extra-4.4.0-59-generic, linux-image-4.4.0-59-powerpc64-smp
• USN-3169-1: linux-image-4.4.0-59-powerpc64-emb, linux-image-4.4.0-59-powerpc-smp, linux-image-4.4.0-59-lowlatency, linux-image-4.4.0-59-powerpc-e500mc, linux-image-4.4.0-59-generic-lpae, linux-image-4.4.0-59-generic, linux, linux-image-extra-4.4.0-59-generic, linux-image-4.4.0-59-powerpc64-smp
• USN-3167-1: linux-image-3.2.0-120-omap, linux-image-highbank, linux-image-3.2.0-120-powerpc-smp, linux-image-generic-pae, linux-image-virtual, linux-image-powerpc-smp, linux-image-omap, linux, linux-image-powerpc64-smp, linux-image-3.2.0-120-generic, linux-image-3.2.0-120-generic-pae, linux-image-3.2.0-120-virtual, linux-image-generic, linux-image-3.2.0-120-powerpc64-smp, linux-image-3.2.0-120-highbank
• USN-3167-2: linux-ti-omap4, linux-image-3.2.0-1498-omap4, linux-image-omap4
• USN-3169-3: linux-raspi2, linux-image-4.4.0-1040-raspi2
• USN-3169-4: linux-image-4.4.0-1044-snapdragon, linux-snapdragon
• USN-3170-2: linux-image-4.8.0-1022-raspi2, linux-raspi2, linux-image-raspi2